384 Mh. К, 5. ADAMSON : AN ECOLOGICAL STUDY 
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EXPLANATION OF THE PLATEs. 
PLATE 12. 
Central part of Gamlingay Wood, showing distribution of trees and shrubs of (Ash) Oak- 
Hazel Wood on calcareous clay and of Dry Oak Wood on an island of non-calcareous 
clay. 
PLATE 13. 
The same, showing distribution of societies of the ground flora. 
PLATE 14. 
Fig. 1. Spiræa Ulmaria Society. Vernal aspect, with Primula elatior and first leaves of 
Spiræa. | 
2. Spirea Ulmaria Society. A wet part with Carex riparia very abundant. 
